在 2021/8/9 下午6:09, Xie Yongji 写道:
The size passed to alloc_iova() should be the size of page frames.
Now we use byte granularity for the iova domain, so it's safe to
pass the size in bytes to alloc_iova(). But it would be better to use
iova_shift() for the size to avoid future bugs if we change granularity.
Signed-off-by: Xie Yongji <xieyongji@xxxxxxxxxxxxx>
Reviewed-by: Stefano Garzarella <sgarzare@xxxxxxxxxx>
Acked-by: Jason Wang <jasowang@xxxxxxxxxx>
---
drivers/vdpa/vdpa_sim/vdpa_sim.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
index 14e024de5cbf..1ccf615221fe 100644
--- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
@@ -137,7 +137,8 @@ static dma_addr_t vdpasim_map_range(struct vdpasim *vdpasim, phys_addr_t paddr,
int ret;
/* We set the limit_pfn to the maximum (ULONG_MAX - 1) */
- iova = alloc_iova(&vdpasim->iova, size, ULONG_MAX - 1, true);
+ iova = alloc_iova(&vdpasim->iova, size >> iova_shift(&vdpasim->iova),
+ ULONG_MAX - 1, true);
if (!iova)
return DMA_MAPPING_ERROR;
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